EP1203832A2 - Procédé de fabrication d'un ruban en uranium à grains fins solidifié rapidement par un cylindre refroidisseur et appareil de fabrication - Google Patents

Procédé de fabrication d'un ruban en uranium à grains fins solidifié rapidement par un cylindre refroidisseur et appareil de fabrication Download PDF

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Publication number
EP1203832A2
EP1203832A2 EP01204159A EP01204159A EP1203832A2 EP 1203832 A2 EP1203832 A2 EP 1203832A2 EP 01204159 A EP01204159 A EP 01204159A EP 01204159 A EP01204159 A EP 01204159A EP 1203832 A2 EP1203832 A2 EP 1203832A2
Authority
EP
European Patent Office
Prior art keywords
uranium
foil
melt
fabrication
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01204159A
Other languages
German (de)
English (en)
Other versions
EP1203832A3 (fr
EP1203832B1 (fr
Inventor
Chang-Kyu Kim
Ki-Hwan Kim
Seok-Jin Oh
Se-Jung Jang
Eung-Soo Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Atomic Energy Research Institute KAERI
Korea Electric Power Corp
Original Assignee
Korea Atomic Energy Research Institute KAERI
Korea Electric Power Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Atomic Energy Research Institute KAERI, Korea Electric Power Corp filed Critical Korea Atomic Energy Research Institute KAERI
Publication of EP1203832A2 publication Critical patent/EP1203832A2/fr
Publication of EP1203832A3 publication Critical patent/EP1203832A3/fr
Application granted granted Critical
Publication of EP1203832B1 publication Critical patent/EP1203832B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C43/00—Alloys containing radioactive materials

Definitions

  • the present invention relates generally to a fabrication process for uranium foil having fine crystalline grains solidified rapidly from a melt using cooling rolls, and foil fabrication apparatus.
  • the present invention relates to low or high enrichment uranium and uranium alloy foil, the fabrication apparatus, and the fabrication process therefore wherein uranium (U) and uranium alloy [U-(A)Q-(B)X-(C)Y (Q: Al, Fe, Ni, Si, Cr, Zr element, X: Al, Fe, Ni, Si, Cr, Zr element, Y: Al, Fe, Ni, Si, Cr, Zr element, Q ⁇ X ⁇ Y, (A) ⁇ 1 wt%, (B) ⁇ 1 wt%, (C) ⁇ 1 wt%)] foils are directly cast from a melt, not through a vacuum induction melting & casting, ingot-cutting, hot-rolling and heat-treatment process, but through a twin-roll-casting process.
  • the conventional fabrication method for uranium foil has the disadvantages of complicated processes as follows: casting the uranium or the uranium alloy after holding at about 1300 °C in a vacuum induction furnace; cutting the resulting rod-type ingot to suitable size for hot rolling at 600 °C or higher; rolling through many passes a thick piece of the ingot to gradually thin it to fabricate a uranium foil of 100-200 ⁇ m thickness; and finally heat-treatment at 800 °C and quenching the fabricated uranium foil to produce the required gain size and orientation.
  • the uranium In the conventional method, the uranium must be heated and rolled under vacuum or in an inert atmosphere because it is a reactive material. The hot rolling is repeated several times to obtain a suitable thickness of the uranium foil. As the hot-rolling process takes long time, productivity is relatively low. A washing/drying process must be done to remove surface impurities after hot rolling. In order to obtain the fine grain structure which has a more stable behavior during irradiation, heat-treatment and quenching must be performed. The high hardness and low ductility of uranium or uranium alloy make it difficult to roll the foil. The foil is liable to crack owing to residual stress during the process, resulting in a low yield. The present invention is expected to improve the economy of producing uranium foil, due to a higher productivity and yield than the conventional method.
  • a uranium foil having excessive residual stress from hot rolling may be deformed or damaged during thermal cycling during irradiation. Furthermore, deformed areas or cracks generated during thermal cycling may act as penetration paths through which there can be an interdiffusion reaction of the uranium with a coating layer, such as Al or Ni, which serves as a protector against the reaction of the uranium with a fixed tube in an irradiation target.
  • a coating layer such as Al or Ni
  • the present invention aims to alleviate the problems as described above.
  • Low or high enrichment uranium and uranium alloy foil are fabricated through twin-roll casting of a uranium melt without a hot-rolling process and heat-treatment process.
  • An improvement in productivity and process economics due to process simplification and better quality from the absence of any residual stress on the foil are expected.
  • the said objects of the present invention can be achieved by providing a uranium foil solidified rapidly by twin-roll casting, and an apparatus and a method for fabricating the same.
  • the present invention is achieved by providing an apparatus and a method for fabricating the uranium foil wherein low or high enrichment uranium and alloy element material are weighed and then charged into a heat-resistant crucible equipped with a tundish having a slot.
  • the crucible is mounted at the inner part of a vacuum chamber in which a vacuum of 10 -3 torr or higher can be maintained by a vacuum pump system.
  • the uranium and the alloying elements are melted by high frequency electric power.
  • the alloy melt is fed through the slot to the space between side dams and two rotating rolls driven by an electric motor, and thin foil is formed by pressing the partly solidified melt with the cold rolls.
  • the foil produced is further cooled by supplying inert cooling gas.
  • Fig. 1 shows a schematic view of a configuration of an apparatus for fabricating the uranium foil according to the present invention.
  • FIG. 1 there is an apparatus for fabricating the uranium foil by twin rolls according to the present invention.
  • the apparatus of the present invention comprises: a heat-resistant crucible (2), a tundish having a slot (1), an induction coil (3) connected to a high-frequency generation apparatus (not shown) to increase the temperature of the crucible (2), a vacuum pump system (5) for evacuating the chamber (4) to an appropriate degree of vacuum, a roller (6) installed in the chamber (4), side dams with a resistance heater (not shown) for preventing a rapid decrease of the uranium melt temperature after pouring from the crucible and for guiding the uranium melt into the roller (6), a gas-feeding valve (7) for supplying a cooling gas into the chamber (4), and a recovery container (8) for collecting the fabricated foil.
  • Uranium and alloy elements are charged at the lower part of the heat-resistant crucible (2) mounted at the upper part of the chamber (4). Also a stopper (9) is installed in the crucible.
  • the induction coil (3) mounted around the heat-resistant crucible (2) superheats the charged material to about 200 °C higher than the melting temperature by the high frequency generation apparatus.
  • the vacuum pump system (5) allows an inner part of the chamber (4) to be evacuated to a suitable vacuum of 10 -3 torr or higher and is connected to one side of the chamber (4).
  • the roller (6) is positioned in the same central plane as the slot (1) in the chamber (4). Also, the roller is operated by an electric motor (not shown) to manufacture the uranium foil from an alloy melt poured through the slot (1).
  • the preheated side dams prevent the rapid decrease of the uranium melt temperature after pouring from the crucible and guide the uranium melt into the roller (6).
  • the alloy melt fed through the slot (1) is fabricated into uranium foil by the rotating rolls driven by the electric motor, and the resulting foil is rapidly cooled under argon or helium cooling gas.
  • the gas-feeding valve (7) connected to the chamber (4), feeds inert argon or helium cooling gas into the chamber (4) to rapidly cool the uranium foil fabricated by the cooling roller (6).
  • the recovery container (8) at the bottom part of the chamber (4) collects the thin foil (10) manufactured in the chamber (4).
  • uranium material is charged into a heat-resistant crucible (2) having a slot (1).
  • the crucible (2) and an insulation material (not shown) are assembled in proper order in a fabrication apparatus.
  • the steel chamber in the apparatus equipped with the crucible (2) is evacuated to a vacuum of 10 -3 torr or higher by a vacuum pump system (5).
  • a high frequency generator (3) is operated to superheat the charge material of the crucible to a temperature of about 200 °C higher than the melting temperature of the uranium.
  • the poured alloy melt passes through the slot (1) of 1-mm width and then is fed to the space between the preheated side dams (not shown) and the roller (6) rotating at about 300 rpm to form the thin foil (10).
  • a gas-feeding valve (7) is operated to supply the chamber (4) with the inert cooling gas, whereby the foil (10) fabricated by the roller (6) is rapidly solidified (at a rate greater than 10 3 °C/sec).
  • a uranium foil having fine and randomly orientated grains is directly obtained by such a rapid solidification effect, it is not necessary to heat-treat the foil and quench from about 800 °C to form fine grains.
  • the uranium foil is collected within a recovery container (8) installed at the bottom of the chamber (4).
  • the foil in the recovery container (8) is about 125 ⁇ m thick and the foil with an acceptable thickness is recovered at about 90% yield.
  • a piece of uranium foil prepared as previously described is assembled with other components to fabricate an irradiation target, in order to charge into a reactor for producing fission isotope 99 Mo, the only parent nuclide of 99m Tc, which is an extremely useful tool for medical diagnosis.
  • This invention is applied to a uranium alloy of low or high enrichment uranium [U-(A)Q-(B)X-(C)Y (Q: Al, Fe, Ni, Si, Cr, Zr elements, X: Al, Fe, Ni, Si, Cr, Zr elements, Y: Al, Fe, Ni, Si, Cr, Zr elements, Q ⁇ X ⁇ Y, (A) ⁇ 1 wt%, (B) ⁇ 1 wt%, (C) ⁇ 1 wt%)] foil for the irradiation target.
  • uranium and alloy elements including Fe, Al and Ni are appropriately weighed according to the desired alloy composition and charged to the crucible.
  • the steel chamber (4) is evacuated to 10 -3 torr or higher using the vacuum pump system (5) as described in a fabrication procedure for uranium foil.
  • the high frequency generator (3) is operated to superheat the charge material of the crucible to a temperature about 200 °C higher than the melting temperature of the uranium alloy.
  • the discharged alloy melt passes through the slot (1) of 1.2 mm width and then is fed to the space between the preheated side dams (not shown) and the roller (6) rotating at the high speed of 300 rpm to form the thin foil (10).
  • the gas-feeding valve (7) is operated to inject the inert cooling gas into the chamber (4), whereby the foil (10) fabricated by the roller (6) is quickly solidified (10 3 °C/sec or faster).
  • the uranium alloy foil having fine and randomly orientated grains is directly obtained by such a rapid solidification effect, it is not necessary to heat-treat the hot rolled foil and quench from about 800 °C to form fine grains.
  • the uranium alloy foil is collected within a container (8) installed at the bottom of the chamber (4).
  • the foil in the recovery container (8) is about 150 ⁇ m thick, and foil with a suitable thickness is recovered at a 90% or higher yield.
  • a piece of uranium foil prepared as previously described is assembled with other components to fabricate an irradiation target, in order to charge into a reactor for producing fission isotope 99 Mo, the only parent nuclide of 99m Tc, which is an extremely useful tool for medical diagnosis.
  • the fabrication process of uranium alloy foil by the present invention is greatly simplified compared to the conventional fabrication method, which includes a vacuum induction melting process, a repetitive hot-rolling process, a washing/drying process for removing impurities, such as surface oxides, and a heat-treatment process for obtaining fine isotropic grains.
  • the melt of uranium or uranium alloy is rapidly cooled to directly fabricate the uranium foil, the uranium or uranium foil, being difficult to roll due to its high toughness, can be easily fabricated.
  • the alloy melt may be cast at once to fabricate large amounts of the foil in a few minutes by the present invention, thereby having a high productivity.
  • the uranium foil may be damaged and cracked owing to an induced stress during the hot-rolling process, which leads to a low yield and a reduced economic efficiency.
  • the foil fabrication process by rapid solidification of the present invention has a 90% or higher yield through which several kilograms of the foil can be directly fabricated in a few minutes.
  • the foil fabrication process using preheated side dams and a cooling roller, facilitates control of the width of the foil. Accordingly, the yield of uranium is very high and the economics are highly favorable because enriched uranium is very expensive.
  • foil fabricated by twin rolling has smaller stress than foil obtained through repetitive hot rolling of a uranium plate. Accordingly, deformation or cracking of the foil generated by thermal cycling during the irradiation process can be prevented. Defects in deformation areas or cracks can act as penetration paths for elements in the coating layer of the target. The interaction between coating layer and target will be enhanced by the defects or cracks. However, the foil fabricated by the present invention does not have such paths.
  • uranium foil undergoes large anisotropic growth during irradiation in a reactor.
  • the uranium foil of the present invention has homogeneous and fine grains with random orientation so as to prevent the uranium foil from excessively growing during irradiation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP01204159A 2000-10-31 2001-10-30 Procédé de fabrication d'un ruban en uranium à grains fins solidifié rapidement par un cylindre refroidisseur et appareil de fabrication Expired - Lifetime EP1203832B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2000-0064237A KR100388808B1 (ko) 2000-10-31 2000-10-31 냉각 롤에 의해 용탕으로부터 직접 급속응고시켜 미세한결정립을 가지는 우라늄박판 및 그 제조장치와 제조방법
KR2000064237 2000-10-31

Publications (3)

Publication Number Publication Date
EP1203832A2 true EP1203832A2 (fr) 2002-05-08
EP1203832A3 EP1203832A3 (fr) 2002-05-15
EP1203832B1 EP1203832B1 (fr) 2004-08-11

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ID=19696341

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EP01204159A Expired - Lifetime EP1203832B1 (fr) 2000-10-31 2001-10-30 Procédé de fabrication d'un ruban en uranium à grains fins solidifié rapidement par un cylindre refroidisseur et appareil de fabrication

Country Status (6)

Country Link
US (1) US20020050335A1 (fr)
EP (1) EP1203832B1 (fr)
JP (1) JP3416660B2 (fr)
KR (1) KR100388808B1 (fr)
CN (1) CN1212908C (fr)
CA (1) CA2347209C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2852970A1 (fr) * 2003-03-31 2004-10-01 Korea Atomic Energy Res Procede et dispositif pour fabriquer une feuille d'uranium, et feuille d'uranium ainsi fabriquee

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100467440B1 (ko) * 2002-07-30 2005-01-24 한국수력원자력 주식회사 우라늄봉의 커팅장치
KR100485926B1 (ko) * 2002-06-24 2005-04-29 한국수력원자력 주식회사 우라늄봉의 연속주조 방법 및 장치
KR100470935B1 (ko) * 2002-07-30 2005-02-21 한국수력원자력 주식회사 우라늄봉의 이송장치
US20060102315A1 (en) * 2002-09-27 2006-05-18 Lee Jung G Method and apparatus for producing amorphous alloy sheet, and amorphous alloy sheet produced using the same
US7100670B1 (en) * 2003-09-12 2006-09-05 The United States Of America As Represented By The United States Department Of Energy Method for fabricating uranium foils and uranium alloy foils
KR100666702B1 (ko) * 2005-05-04 2007-01-11 동아대학교 산학협력단 진공챔버에 의한 레오로지 소재의 제조장치
CN103658573B (zh) * 2013-12-09 2015-06-03 武汉钢铁(集团)公司 液态合金真空熔炼单辊甩带方法及其装置
KR101640237B1 (ko) 2015-04-28 2016-07-22 한국원자력연구원 우라늄 알루미나이드 분말의 제조방법 및 이로 제조된 우라늄 알루미나이드 분말
CN105689660B (zh) * 2016-02-26 2017-11-28 沈阳广泰真空科技有限公司 一种双面冷却多功能高效真空速凝炉
US11027330B2 (en) 2016-08-10 2021-06-08 Nucor Corporation Method of thin strip casting
CN108213389A (zh) * 2017-12-29 2018-06-29 安徽高德铝业有限公司 一种真空浇注成形的门窗铝合金型材加工工艺
CN108637197A (zh) * 2018-05-24 2018-10-12 钢铁研究总院 一种大炉容、高效连续制备非晶带材的真空快淬设备和方法
RU2760902C1 (ru) * 2021-05-11 2021-12-01 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Сплав на основе урана (варианты)
CN114309505B (zh) * 2021-12-17 2023-01-10 北京科技大学 一种采用动量布流的金属薄带连铸方法
CN115094351B (zh) * 2022-07-05 2023-01-24 西安交通大学 一种贫铀基吸储氢合金及方法

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US4592411A (en) * 1983-01-17 1986-06-03 Allied Corporation Method of and apparatus for continuously casting metal filament in a vacuum
JPH05287307A (ja) * 1992-04-15 1993-11-02 Seiko Epson Corp 希土類ボンド磁石用合金の製造方法

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US4341261A (en) * 1979-07-18 1982-07-27 Canadian Patents & Dev. Ltd. Method of casting elongated members of reactive metals and reactive metal alloys
US4592411A (en) * 1983-01-17 1986-06-03 Allied Corporation Method of and apparatus for continuously casting metal filament in a vacuum
JPH05287307A (ja) * 1992-04-15 1993-11-02 Seiko Epson Corp 希土類ボンド磁石用合金の製造方法

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DATABASE CHEMICAL ABSTRACTS [Online] J. Metals (1954), 6 AIME Trans. 200, p.999-1003, 1954 W. SEYMOUR: "Preferred orientation of cold-rolled uranium foil" Database accession no. 48:63915 XP002190725 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 072 (M-1555), 7 February 1994 (1994-02-07) & JP 05 287307 A (SEIKO EPSON CORP), 2 November 1993 (1993-11-02) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2852970A1 (fr) * 2003-03-31 2004-10-01 Korea Atomic Energy Res Procede et dispositif pour fabriquer une feuille d'uranium, et feuille d'uranium ainsi fabriquee

Also Published As

Publication number Publication date
CN1350896A (zh) 2002-05-29
JP3416660B2 (ja) 2003-06-16
US20020050335A1 (en) 2002-05-02
EP1203832A3 (fr) 2002-05-15
KR100388808B1 (ko) 2003-06-25
CA2347209C (fr) 2009-12-01
CN1212908C (zh) 2005-08-03
JP2002143990A (ja) 2002-05-21
KR20020033961A (ko) 2002-05-08
EP1203832B1 (fr) 2004-08-11
CA2347209A1 (fr) 2002-04-30

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